CD74HCT646E

更新时间： 2024-11-23 12:55:11

品牌	Logo	应用领域
德州仪器 - TI		总线收发器触发器逻辑集成电路光电二极管输出元件输入元件
页数	文件大小	规格书
18页	584K
描述
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

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CD74HCT646E 数据手册

CD54HC646, CD74HCT646

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCHS278B – APRIL 2003 – REVISED APRIL 2003

CD54HC646 . . . F PACKAGE

CD74HCT646 . . . M PACKAGE

(TOP VIEW)

2-V to 6-V V

Operation (CD54HC646)

4.5-V to 5.5-V V

Operation (CD74HCT646)

Wide Operating Temperature Range of

–55°C to 125°C

CLKAB

SAB

DIR

GND

CLKBA

SBA

Balanced Propagation Delays and

Transition Times

Standard Outputs Drive Up To 15 LS-TTL

Loads

Significant Power Reduction Compared to

LS-TTL Logic ICs

Inputs Are TTL-Voltage Compatible

(CD74HCT646)

Independent Registers for A and B Buses

Multiplexed Real-Time and Stored Data

True Data Paths

description/ordering information

The CD54HC646 and CD74HCT646 consist of bus-transceiver circuits with 3-state outputs, D-type flip-flops,

and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal

registers. Data on the A or B bus is clocked into the registers on the low-to-high transition of the appropriate

clock (CLKAB or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that can

be performed with these devices.

Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver

mode, data present at the high-impedance port can be stored in either or both registers.

The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. DIR

determines which bus receives data when OE is active (low). In the isolation mode (OE high), A data can be

stored in one register and/or B data can be stored in the other register.

When an output function is disabled, the input function still is enabled and can be used to store data. Only one

of the two buses, A or B, can be driven at a time.

To ensure the high-impedance state during power up or power down, OE should be tied to V through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

ORDERING INFORMATION

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

†

PACKAGE

SOIC – M

CDIP – F

Tape and reel

Tube

CD74HCT646M96 HCT646M

CD54HC646F3A CD54HC646F3A

–55°C to 125°C

†

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design

guidelines are available at www.ti.com/sc/package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...18

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与CD74HCT646E相关器件

型号	品牌	获取价格	描述	数据表
CD74HCT646EN	TI	获取价格	Bus Transceiver
CD74HCT646EN	ROCHESTER	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDIP24, PACKAGE-24
CD74HCT646EX	RENESAS	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,HCT-CMOS,DIP,24PIN,PLASTIC
CD74HCT646F	ETC	获取价格	Logic IC
CD74HCT646H	ETC	获取价格	Single 8-bit Bus Transceiver
CD74HCT646M	RENESAS	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24
CD74HCT646M	ROCHESTER	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, PACKAGE-24
CD74HCT646M	TI	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, PLASTIC, SOIC-24
CD74HCT646M96	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
CD74HCT646M96	ROCHESTER	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, PACKAGE-24

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